[COMMITTERS] pgsql: Change string to string.

[Bruce Momjian]

Log Message:
-----------
Change <type>string</> to <parameter>string</>.

Modified Files:
--------------
    pgsql/doc/src/sgml:
        func.sgml (r1.317 -> r1.318)
        
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/func.sgml.diff?r1=1.317&r2=1.318)

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